Improvement in coal-oil lanterns



P. J. CLARK.

Lantern.

Patented April 14, 1863.

No. 38,199. I

Whessea mad UNITED STATES PATENT OFFICE.

P. J. CLARK, OF WEST MERIDEN, CONNECTICUT, ASSIGNOR TO S. S. CLARK, OF SAME PLACE.

IMPROVEMENT IN COAL-OIL LANTERNS.

Specification forming part of Letters Patent No. 38,199, dated April 14, 1863.

To all whom it may concern:

Be it known that I, P. J. CLARK, of West Meriden, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Lanterns for Burning Coal-Oil; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 is a vertical central section of my invention; Fig. 2, an external detached view of the lamp pertaining to the same.

Similar letters of reference indicate corresponding parts in the two figures.

This invention relates to a lantern for burning coal-oil without the aid of a draft-chimney, and has for its object the supplying of the flame of the lamp with a requisite amount of air to support proper combustion for illuminating purposes, and at the same time admitting the air into the lantern in such a manner that the flame will not be extinguished by an upanddown or swinging movement of the lantern.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents the glass flame-protector of a lantern, the upper part of which has a perforated metal cap, B, secured to it, with a handle, C, attached, the lower part having a metal base, D, secured to it, which is perforated at its side. The base D at its lower end has a flange, E, on it, the upper part of which projects within the base D, so as to form an annular horizontal projection, a, all around its inner side. (See Fig. 1.)

F is the lamp of the lantern, which may be of cylindrical form, and provided with a coal oil burner, G, of any proper construction. The lamp has a jacket, H, fitted over it, which is of slightly conical form, and is turned or bent down at its upper end, so as to project a short distance over the top of the lamp, as shown at b in Fig. 1. The jacket H is sufficiently larger in diameter than the lamp F to form an air-duct, 0, which, owing to the conical form of the jacket H, is larger at its lower than at its upper end. The upper bent part, b, of the jacket is not in contact with the top of the lamp, a space, d, being allowed for the escape of the air into the lantern, and this space at is much narrower than the lower end of the air-duct 0. By having the upper end of the jacket H bent, as shown at b, and project over the top of the lamp F, the air that passes up through c is made to pass directly into the burner G and impinge against the base of the flame, (see red arrows, Fig. 1,) and, owing to the narrow width of the upper end of the air-duct 0, the rapidity of the current of air is greatly accelerated and is made to pass into the burner. This is an important feature of the invention, for if the air passed sluggishly from the orifice of c it would diffuse itself directly upward through the lantern and a great por' tion would not come in contact with the flame. When the lantern is placed upon the ground, the flame is supplied only with the air that passes through the perforatories in the side of the vase D. (See black arrows, Fig. 1.) This will be sufficient for a temporary supply, as lanterns are not generally designed to remain long in such a position. If necessary or desired, however, the flange E may be perforated to admit of the passage of air up through the duct 0. By this arrangement of the jacket H the flame of the lamp is not only supplied with a requisite amount of air to support proper combustion, but the flame also is prevented from being extinguished by an upor-down or a swinging movement of the lantern, as a free passage is allowed for the air to pass up and down through the duct 0, and a "acuum is prevented from being formed around the flame, and the air also prevented from being compressed in the lower part of the lantern around the flame.

I would remark that the lamp may he held in the lantern by means of springcatches I I, (shown in Fig. 2,) or any other suitable fastening may be employed.

I do not claim, broadly, the use of a cup, jacket, or diaphragm in lanterns, so as to give a particular direction to the ingress of air 5 1 duct is open and free, the upper part or space but, 01 will be narrow, and thus compress the air Having thusdeseribed my invention, What into a thin sheet and. cause it to shoot with I claim as new, and desire to secure by Letters increased velocity into the interior of the burner Patent, is Gr, all as set forth.

The peculiar construction and arrangement, herein shown and described, of the jacket H, Witnesses: in combination with the lamp E and burner "GEORGE W. SMITH, G, so that While the lower part of the air- W. D. BOOTH.

7 P. J. CLARK. 

